GB8418149D0 - Chemical compounds - Google Patents

Abstract

Object of the present invention are new pharmacologically active amidine derivatives of 2-substituted 4-phenylimidazole of formula <CHEM> in which R representa a linear or branched alkyl group, a hydroxy group, a C1-3 alkoxy group, a mercapto group, C1-3 alkylthio group, a halogen atom, a C1-3 alkylsulfinyl or alkylsulfonyl group, a sulfamoyl group, an amino group which may be substituted by one or two alkyl groups having 1 to 3 carbon atoms, an acylamino group or a phenyl group; R1 and R2, which may be the same or different, represent a hydrogen atom or an alkyl group; R3 represents a linear or branched alkyl group containing optionally one heteroatom such as an oxygen, a sulphur or a nitrogen atom, an alkenyl group, an alkynyl group, a cyano group, an aryl or an aralkyl group optionally substituted, a cycloalkyl or cycloaliphatic alkyl group, a substituted or unsubstituted heterocyclilalkyl or heterocyclic group; R4 represents a hydrogen atom, a C1-3 alkyl or alkoxy group, a halogen atom, a cyano or carbamoyl group, tautomeric forms thereof and acid addition salts thereof. <??>Processes for the preparation of the compounds of formula (1) and their intermediates as well as the pharmaceutical compositions containing them are also object of this invention. <??>The new compounds are H2-receptor blocking agents which inhibit the gastric acid secretion and are useful antiulcer agents.